20092008²/(20092009²+20092007²-2)
来源:学生作业帮助网 编辑:作业帮 时间:2024/06/30 21:59:00
![20092008²/(20092009²+20092007²-2)](/uploads/image/z/12582896-32-6.jpg?t=20092008%26%23178%3B%2F%2820092009%26%23178%3B%2B20092007%26%23178%3B-2%29)
20092008²/(20092009²+20092007²-2)
20092008²/(20092009²+20092007²-2)
20092008²/(20092009²+20092007²-2)
20092008²/(20092009²+20092007²-2)
=20092008²/((20092008+1)²+(20092008-1)²-2)
=20092008²/(20092008²+2*20092008²*1+1²+20092008²-2*20092008²*1+1²-2)
=20092008²/(2*20092008²)
=1/2